A kind of flexible carbon film and preparation method thereof

A carbon film and flexible technology, which is applied in the field of preparing high-performance flexible carbon film, can solve the problems of small average grain size, few defects, and poor flexibility, and achieve the effects of less defects, improved brittleness, and high thermal conductivity

Active Publication Date: 2018-07-17
DONGHUA UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention relates to a kind of flexible carbon film and its preparation method, and its purpose is to improve the brittleness of conventional carbon film, the shortcoming of poor flexibility, not easy to peel off the substrate, the flexible carbon film in the present invention is made up of highly oriented graphite sheet and graphite crystallite ; Graphite sheets have an inductive effect on the formation of graphite microcrystals, and the graphite microcrystals induced by it are aligned and oriented along the surface of graphite sheets; the flexible carbon film prepared by the present invention has a compact structure, a large degree of order, few defects and an average crystal grain Small size, high flexibility, high electrical conductivity, high strength and high thermal conductivity

Method used

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  • A kind of flexible carbon film and preparation method thereof
  • A kind of flexible carbon film and preparation method thereof

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Effect test

Embodiment 1

[0055] A kind of preparation method of flexible carbon membrane, by blending method, the graphene oxide dispersion liquid that concentration is 0.5wt% and the polyacrylonitrile (polyacrylonitrile that comprises the first monomer acrylonitrile) solution that concentration is 9wt% pass through Mechanical stirring and mixing; the graphene oxide dispersion needs to be ultrasonically dispersed before use. The treatment time is 0.5 hours and the temperature is 10°C. The graphene oxide dispersion contains the same solvent as the polyacrylonitrile solution, and the solvent is dimethylformamide. The time of mechanical stirring and mixing is 1h, the rotating speed is 50 rpm, and the temperature is 10°C; then the solution is subjected to vacuum defoaming treatment for 0.5h to obtain a graphene oxide / polyacrylonitrile composite solution; the prepared graphene oxide / polyacrylonitrile The concentration of polyacrylonitrile in the polyacrylonitrile composite solution is 20wt%, and the mass fr...

Embodiment 2

[0058] A kind of preparation method of flexible carbon membrane, by in-situ polymerization method, the concentration is the monomer (the monomer comprises the first monomer acrylonitrile) solution of 10wt%, the initiator azobisisobutyronitrile and the concentration of 0.5wt% The graphene dispersion liquid is mixed evenly to make a polymerization solution; the graphene dispersion liquid needs to be dispersed by magnetic stirring before use, the processing time is 12 hours, the temperature is 40 ° C, the graphene dispersion liquid and the polyacrylonitrile solution contain the same solvent, The solvent is dimethyl sulfoxide; the mass fraction of the initiator relative to the monomer is 0.3%; the mass fraction of the graphene relative to the monomer is 0.1%; then polymerize at normal pressure for 1h at 50°C, and then vacuum defoam the solution Treat for 12h to obtain the graphene / polyacrylonitrile composite solution; the conversion rate of the monomer in the prepared graphene / poly...

Embodiment 3

[0061] A kind of preparation method of flexible carbon film, by blending method, concentration is the graphene dispersion liquid of 5wt% and the polyacrylonitrile (comprising the polyacrylonitrile of the first monomer and the polyacrylamide of the second monomer acrylamide) that the concentration is 39wt% Acrylonitrile, wherein the mass fraction of acrylonitrile relative to the total monomer is 80%, and the mass fraction of acrylamide relative to the total monomer is 20%) solution is mixed by mechanical stirring; the graphene dispersion needs to be dispersed through mechanical stirring before use. The time is 10 hours, the temperature is 35 °C, the graphene dispersion and the polyacrylonitrile solution contain the same solvent, and the solvent is dimethylacetamide; the mechanical stirring and mixing time of the graphene dispersion and the polyacrylonitrile solution is 24 hours, and the rotation speed The temperature is 1500 rpm, and the temperature is 50°C; then the solution is...

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Abstract

The invention relates to a flexible carbon film and a preparation method thereof. The flexible carbon film is composed of highly-oriented graphite flakes and graphite microcrystals, wherein the graphite flakes exert induction effect on formation of the graphite microcrystals, and the graphite microcrystals generated under induction are arranged and oriented along the surfaces of the graphite flakes. The carbon film has the characteristics of compact structure, a great ordered degree, few defects and a small average crystal grain size. The carbon film is prepared by subjecting a graphite flake / polyacrylonitrile composite solution to film casting, high-rate drawing and sintering. The flexible carbon film prepared in the invention has rigidity of 10 *<-4> to 10 mN.cm, resistivity of 10<-3> to 100 omega.cm, strength of 5 to 500 MPa and a heat conductivity coefficient of 0.5 to 50 W / m.k; and the flexible carbon film has greatly improved structural performance and high market application value and is extensively applicable to fields like electrode materials, functional materials and energy materials.

Description

technical field [0001] The invention belongs to the technical field of composite film preparation, and relates to a flexible carbon film and a preparation method thereof, in particular to a method for preparing a high-performance flexible carbon film by using conventional polyacrylonitrile as a raw material. Background technique [0002] Carbon film is a new type of material with great development and application prospects. It has many excellent properties, such as high hardness, chemical inertness, low friction coefficient, high impedance, good heat conduction and excellent electrical conductivity. It is widely used in Electrode materials, magnetic memory devices, high temperature semiconductor materials, mechanical tools and other fields. At present, the methods for preparing carbon films can be roughly divided into physical vapor deposition and chemical vapor deposition. These methods require the use of large equipment, high production costs, and low yields, and it is dif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/52C04B35/622
CPCC04B35/522C04B35/62218C04B2235/48C04B2235/96C04B2235/9607
Inventor 李凤美王彪郑迎迎王华平
Owner DONGHUA UNIV
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